Questions & Answers
Browse all 20 questions from the
Fundamental Chemistry Knowledge Challenge study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
What is the atomic number of the element with the chemical symbol Au?
2
Which of the following is an allotrope of carbon, known for its extreme hardness and often used in cutting tools?
-
A
Graphite
-
B
Fullerene
-
C
Amorphous carbon
-
D
Diamond
3
What is the common name for the compound H₂O₂?
-
A
Water
-
B
Carbon dioxide
-
C
Hydrogen peroxide
-
D
Ozone
4
The process by which a solid changes directly into a gas is called:
-
A
Condensation
-
B
Evaporation
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C
Sublimation
-
D
Deposition
5
What is the molar mass of pure water (H₂O) in grams per mole, rounded to two decimal places?
-
A
16.00
-
B
18.02
-
C
34.01
-
D
2.02
6
Which noble gas is the most abundant in Earth's atmosphere?
-
A
Helium
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B
Neon
-
C
Argon
-
D
Krypton
7
The pH scale measures the acidity or alkalinity of a solution. A pH of 7 is considered:
-
A
Acidic
-
B
Neutral
-
C
Basic
-
D
Strongly acidic
8
What is the primary component of natural gas?
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A
Ethane
-
B
Propane
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C
Methane
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D
Butane
9
Which element is known as the 'king of metals' due to its resistance to corrosion and high value?
-
A
Silver
-
B
Platinum
-
C
Gold
-
D
Copper
10
What type of chemical bond involves the sharing of electron pairs between atoms?
-
A
Ionic bond
-
B
Metallic bond
-
C
Covalent bond
-
D
Hydrogen bond
11
The process of a liquid turning into a solid is called:
-
A
Melting
-
B
Freezing
-
C
Boiling
-
D
Vaporization
12
What is the chemical formula for sulfuric acid?
-
A
HCl
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B
HNO₃
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C
H₂SO₄
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D
H₃PO₄
13
Which of these is a halogen?
-
A
Oxygen
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B
Nitrogen
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C
Chlorine
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D
Sulfur
14
The phenomenon where a substance absorbs moisture from the air is known as:
-
A
Dehydration
-
B
Deliquescence
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C
Efflorescence
-
D
Adsorption
15
What is the common name for solid carbon dioxide (CO₂)?
-
A
Liquid nitrogen
-
B
Dry ice
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C
Snow
-
D
Melted butter
16
Which element has the chemical symbol Fe?
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A
Fluorine
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B
Iron
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C
Phosphorus
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D
Fermium
17
The law of conservation of mass states that matter is neither created nor destroyed in a chemical reaction. What is the approximate percentage of Earth's atmosphere that is nitrogen?
18
What is the basic unit of matter?
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A
Molecule
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B
Atom
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C
Ion
-
D
Compound
19
Which of the following is a transition metal?
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A
Sodium
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B
Potassium
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C
Calcium
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D
Copper
20
What is the process by which plants convert light energy into chemical energy?
-
A
Respiration
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B
Fermentation
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C
Photosynthesis
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D
Combustion
